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iMac (Early 2009)

LEM Staff - 2009.03.03

Apple has updated the iMac with Nvidia graphics as a standard feature (the Early 2008 iMac used Radeon graphics, although there was an Nvidia GeForce 8800 GS build-to-order option for the 24″ model). The low-end iMacs use the same Nvidia GeForce 9400M GPU found in current MacBooks and the new Mac mini, while the high-end iMacs use GeForce GT graphics. (ATI Radeon HD 4850 is a build-to-order option on the high-end iMacs.)

The March 2009 iMacs have four USB 2.0 ports (one more than before), FireWire 800 (but no longer 400), gigabit ethernet, 802.11n WiFi, Bluetooth 2.1+EDR, and an 8x SuperDrive – as well as a slim keyboard with two USB 2.0 ports. They support up to 8 GB of RAM and are the first iMacs to use SATA optical drives.

The 20″ iMac has 2 GB of RAM, a 320 GB hard drive, an 8x SuperDrive, Nvidia GeForce 9400M graphics, and Apple’s aluminum keyboard and Mighty Mouse. 256 MB of system RAM is dedicated to video. The 24″ 2.66 GHz model includes 4 GB of RAM and a 640 GB hard drive.

The 2.93 GHz iMac replaces integrated 9400M graphics with discrete GeForce GT 120 graphics with 256 MB of dedicated VRAM; this can be replaced by Radeon HD 4850 on a build-to-order basis. The top-end 3.06 GHz iMac has a 1 TB hard drive and GT 130 graphics with 512 MB of VRAM.

Although it is not officially supported, the Early 2009 iMac can run macOS Sierra using Colin Mistr’s Sierra Patch Tool. See our macOS Sierra page for more details and a link.

Note that 20″ aluminum iMacs use an 18-bit LCD, which can only display 262,144 colors, not the “millions” all other iMacs can display. This should be good enough for most users.

Intel-based Macs use a partitioning scheme known as GPT. Only Macintel models can boot from GPT hard drives. Both PowerPC and Intel Macs can boot from APM (Apple’s old partitioning scheme) hard drives, which is the format you must use to create a universal boot drive in Leopard. PowerPC Macs running any version of the Mac OS prior to 10.4.2 cannot mount GPT volumes. PowerPC Macs won’t let you install OS X to a USB drive or choose it as your startup volume, although there is a work around for that.

SuperDrive: writes DVD±R, DVD+R, and DVD+RW discs at up to 8x speed, DVD-RW at up to 6x; dual layer at up to 4x; reads DVDs at up to 8x, writes CD-R discs at up to 24x, writes CD-RW discs at up to 16x, reads CDs at up to 24x

CPU Upgrades

Online Resources

Know Your Mac’s Upgrade Options, Phil Herlihy, The Usefulness Equation, 2008.08.26. Any Mac can be upgraded, but it’s a question of what can be upgraded – RAM, hard drive, video, CPU – and how far it can be upgraded.

Mac mini the best value in desktop Macs, Dan Knight, Mac Musings, 2009.08.25. Although the iMac is faster all around, the Mac mini provides plenty of power at half the price. Even with the cost of upgrades, it’s the value champion.

The Road Ahead: 64-bit Computing, Dan Knight, Mac Musings, 2009.08.19. Personal computers started with 8-bit CPUs, Macs started out with a 24-bit operating system, and 32-bit computing is starting to give way to 64 bits.

Computer disaster ends happily, Alan Zisman, Zis Mac, 2009.08.05. The iMac was getting slower and slower, and Disk Utility kept trying to fix the same problems. With a new hard drive, the iMac is running as well as ever.

Why You Should Partition Your Mac’s Hard Drive, Dan Knight, Mac Musings, 2008.12.11. “At the very least, it makes sense to have a second partition with a bootable version of the Mac OS, so if you have problems with your work partition, you can boot from the ’emergency’ partition to run Disk Utility and other diagnostics.”

How to clone Mac OS X to a new hard drive, Simon Royal, Tech Spectrum, 2008.10.07. Whether you want to put a bigger, faster drive in your Mac or clone OS X for use in another Mac, here’s the simple process.

Simple Mac security in the age of malware, Kev Kitchens, Kitchens Sync, 2008.08.13. Unlike Windows PCs, at this point Macs can’t become infected simply from being on the Internet, but you still need to be careful about your downloads.

Win the depreciation game by buying on the low end, Charles W Moore, ‘Book Value, 2008.06.24. The worst depreciation afflicts high-end models. By buying a less powerful version, choosing certified refurbished, or picking up a used computer, you’ll come out ahead.

5 business essentials for ‘The Switch’, Jason Packer, Macs in the Enterprise, 2008.06.06. If you’re planning a migration from Windows to Macs, these five steps will help you succeed in making the switch.

Windows on Macs: Three paths for integration, Jason Packer, Macs in the Enterprise, 2008.05.14. Mac users have three routes for running Windows apps: Run Windows using Boot Camp or virtualization, or use a compatibility layer such as WINE.

50% Mac sales growth is only the beginning, Dan Knight, Mac Musings, 2008.05.02. Apple has a great line of computers and an awesome operating system, but a prosumer model could make last quarter’s growth seem normal.

The best alternatives to Apple’s USB keyboards, Charles W Moore, Miscellaneous Ramblings, 2007.12.10. There are a lot of USB keyboards out there, even for the Mac, but these two have great keyboard action, are solidly built, and have features Apple’s keyboard don’t include.

Cross-platform computing: Better than it’s ever been, Andrew J Fishkin, Best Tools for the Job, 2007.11.13. Macs can read PC media, both Macs and Windows PCs play nice with each other on networks, and emulation makes it easy for Intel Macs to run Windows apps.